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Consolidated Statements Of Shareholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Common Stock [Member]
Revision of Prior Period, Accounting Standards Update, Adjustment [Member]
Common Stock [Member]
Additional Paid-In Capital [Member]
Revision of Prior Period, Accounting Standards Update, Adjustment [Member]
Additional Paid-In Capital [Member]
Treasury Stock [Member]
Revision of Prior Period, Accounting Standards Update, Adjustment [Member]
Treasury Stock [Member]
Retained Earnings [Member]
Revision of Prior Period, Accounting Standards Update, Adjustment [Member]
Retained Earnings [Member]
Available-For-Sale Securities [Member]
Revision of Prior Period, Accounting Standards Update, Adjustment [Member]
Available-For-Sale Securities [Member]
Foreign Currency Translation [Member]
Revision of Prior Period, Accounting Standards Update, Adjustment [Member]
Foreign Currency Translation [Member]
Revision of Prior Period, Accounting Standards Update, Adjustment [Member]
Total
Balance (Accounting Standards Update 2016-02 [Member]) at Dec. 31, 2018 $ 0   $ 0   $ 0   $ (2,327)   $ 0   $ 0   $ (2,327)  
Balance at Dec. 31, 2018   $ 360   $ 1,374,154   $ (2,500,556)   $ 2,573,617   $ (147)   $ (6,089)   $ 1,441,339
Balance, Shares (Accounting Standards Update 2016-02 [Member]) at Dec. 31, 2018 0                          
Balance, Shares at Dec. 31, 2018   35,973       8,276                
Stock-based compensation   $ 0   92,062   $ 0   0   0   0   92,062
Stock-based compensation, Shares   0       0                
Stock plan transactions and other   $ 3   (519)   $ 0   0   0   0   (516)
Stock plan transactions and other, Shares   350       0                
Acquisition of treasury stock   $ 0   0   $ (198,563)   0   0   0   (198,563)
Acquisition of treasury stock, Shares   0       292                
Net income   $ 0   0   $ 0   350,158   0   0   350,158
Other comprehensive income (loss), net of income tax   0   0   0   0   147   726   873
Balance (Accounting Standards Update 2016-13 [Member]) at Dec. 31, 2019 $ 0       $ 0   $ (1,051)   $ 0   $ 0   $ (1,051)  
Balance at Dec. 31, 2019   $ 363   1,465,697   $ (2,699,119)   2,921,448     (5,363)   1,683,026
Balance, Shares (Accounting Standards Update 2016-13 [Member]) at Dec. 31, 2019 0   0                      
Balance, Shares at Dec. 31, 2019   36,323       8,568                
Stock-based compensation   $ 0   84,463   $ 0   0   0   0   84,463
Stock-based compensation, Shares   0       0                
Stock plan transactions and other   $ 4   (251)   $ 0   0   0   0   (247)
Stock plan transactions and other, Shares   381       0                
Acquisition of treasury stock   $ 0   0   $ (102,956)   0   0   0   (102,956)
Acquisition of treasury stock, Shares   0       135                
Net income   $ 0   0   $ 0   355,766   0   0   355,766
Other comprehensive income (loss), net of income tax   0   0   0   0   0   1,134   1,134
Balance at Dec. 31, 2020   $ 367   1,549,909   $ (2,802,075)   3,276,163   0   (4,229)   2,020,135
Balance, Shares at Dec. 31, 2020   36,704       8,703                
Stock-based compensation   $ 0   178,703   $ 0   0   0   0   178,703
Stock-based compensation, Shares   0       0                
Stock plan transactions and other   $ 4   700   $ 0   0   0   0   704
Stock plan transactions and other, Shares   428       0                
Acquisition of treasury stock   $ 0   0   $ (554,027)   0   0   0   (554,027)
Acquisition of treasury stock, Shares   0       349                
Net income   $ 0   0   $ 0   652,984   0   0   652,984
Other comprehensive income (loss), net of income tax   0   0   0   0   0   (1,125)   (1,125)
Balance at Dec. 31, 2021   $ 371   $ 1,729,312   $ (3,356,102)   $ 3,929,147   $ 0   $ (5,354)   $ 2,297,374
Balance, Shares at Dec. 31, 2021   37,132       9,052